From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The working temperatures of standard exhaust and water heated systems at full throttle, including a performance graph.
| Identifier | ExFiles\Box 66\2\ scan0153 | |
| Date | 2nd February 1926 guessed | |
| contd :- -3- to either of the other two. Further tests we have made are given later - these go to prove that the temperature rise of the standard exhaust heated system is greater than the other two, also that its normal working temperature is higher. We have further shown by experiment that this proves to be a definite advantage. NORMAL WORKING TEMPS. AT FULL THROTTLE. We here supply curves which show a comparison of the average temperatures of the heating mediums in the hot spot of the standard exhaust and water heated systems. In this case the standard system had the exhaust butterfly throttle wide open :- [Graph Text] Title: AVERAGE WORKING TEMPERATURES AT FULL THROTTLE Y-axis Label: AVERAGE TEMP °F X-axis Label: R.P.M. Upper Line: STD EXH HEATED HOT SPOT Lower Line: SIMPLE WATER HOT SPOT We see from this curve that at 1000 r.p.m. the temp. of the exhaust is lower (45°C) than when running light at the same speed with the exhaust butterfly shut. The table below shews the induction pipe temperature for the above conditions :- contd :- | ||